1. National Institute of Health, 28 March 2016. https://www.nih.gov/news-events/news-releases/worlds-older-population-grows-dramatically . Accessed 1 Nov 2017
2. Overview of Disability, 20 September 2017. http://www.worldbank.org/en/topic/disability . Accessed 15 Nov 2017
3. Fehr, L., Langbein, W.E., Skaar, S.B.: Adequacy of power wheelchair control interfaces for persons with severe disabilities: a clinical survey. J. Rehabil. Res. Dev. 37(3), 353–360 (2000)
4. Bourke, T.: Development of a Robotic Wheelchair, November 2001. http://www.tbrk.org/papers/uowhonours01.pdf . Accessed 20 Nov 2017
5. Lecture Notes in Computer Science (Lecture Notes in Artificial Intelligence);SA Mamun,2016